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The include file <command.h> does not need anything from <env.h>.
Furthermore, include/env.h itself includes other headers which can lead
to longer indirect inclusion paths. To prepare to remove <env.h> from
<command.h> fix all of the places which had relied on this indirect
inclusion to instead include <env.h> directly.
Reviewed-by: Mattijs Korpershoek <[email protected]> # android, bcb
Reviewed-by: Jerome Forissier <[email protected]> # spawn
Signed-off-by: Tom Rini <[email protected]>
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Job IDs are positive integers greater than 1. 0 is not a valid job ID,
therefore fix the comparison in do_wait().
Fixes Coverity defects:
*** CID 550296: Control flow issues (NO_EFFECT)
/cmd/spawn.c: 172 in do_wait()
166 for (i = 0; i < CONFIG_CMD_SPAWN_NUM_JOBS; i++)
167 if (job[i])
168 ret = wait_job(i);
169 } else {
170 for (i = 1; i < argc; i++) {
171 id = dectoul(argv[i], NULL);
>>> CID 550296: Control flow issues (NO_EFFECT)
>>> This less-than-zero comparison of an unsigned value is never true.
"id < 0UL".
172 if (id < 0 || id >
CONFIG_CMD_SPAWN_NUM_JOBS)
173 return CMD_RET_USAGE;
174 idx = (int)id - 1;
175 ret = wait_job(idx);
176 }
177 }
*** CID 550297: Integer handling issues (INTEGER_OVERFLOW)
/cmd/spawn.c: 174 in do_wait()
168 ret = wait_job(i);
169 } else {
170 for (i = 1; i < argc; i++) {
171 id = dectoul(argv[i], NULL);
172 if (id < 0 || id >
CONFIG_CMD_SPAWN_NUM_JOBS)
173 return CMD_RET_USAGE;
>>> CID 550297: Integer handling issues (INTEGER_OVERFLOW)
>>> Expression "idx", where "(int)id - 1" is known to be equal to -1,
overflows the type of "idx", which is type "unsigned int".
174 idx = (int)id - 1;
175 ret = wait_job(idx);
176 }
177 }
Signed-off-by: Jerome Forissier <[email protected]>
CC: Tom Rini <[email protected]>
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Add a spawn command which runs another command in the background, as
well as a wait command to suspend the shell until one or more background
jobs have completed. The job_id environment variable is set by spawn and
wait accepts optional job ids, so that one can selectively wait on any
job.
Example:
=> date; spawn sleep 5; spawn sleep 3; date; echo "waiting..."; wait; date
Date: 2025-02-21 (Friday) Time: 17:04:52
Date: 2025-02-21 (Friday) Time: 17:04:52
waiting...
Date: 2025-02-21 (Friday) Time: 17:04:57
=>
Another example showing how background jobs can make initlizations
faster. The board is i.MX93 EVK, with one spinning HDD connected to
USB1 via a hub, and a network cable plugged into ENET1.
# From power up / reset
u-boot=> setenv autoload 0
u-boot=> setenv ud "usb start; dhcp"
u-boot=> time run ud
[...]
time: 8.058 seconds
# From power up / reset
u-boot=> setenv autoload 0
u-boot=> setenv ud "spawn usb start; spawn dhcp; wait"
u-boot=> time run ud
[...]
time: 4.475 seconds
Signed-off-by: Jerome Forissier <[email protected]>
Acked-by: Ilias Apalodimas <[email protected]>
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